North America Native Plant

Acadian Quillwort

Botanical name: Isoetes acadiensis

USDA symbol: ISAC

Life cycle: perennial

Habit: grass

Native status: Native to Canada âš˜ Native to the lower 48 states  

Acadian Quillwort: The Mysterious Underwater Grass That Isn’t Actually Grass Meet the Acadian quillwort (Isoetes acadiensis), one of nature’s most intriguing botanical puzzles. Despite its grass-like appearance, this fascinating plant is actually more closely related to ancient ferns than to any modern grass. If you’ve ever wondered about those mysterious ...

Rare plant alert!

Region: Conservation status by state

Status: S3Q: Status is uncertain but is somewhere between the following rankings: Uncertain taxonomy: ⚘ Vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals ⚘

Acadian Quillwort: The Mysterious Underwater Grass That Isn’t Actually Grass

Meet the Acadian quillwort (Isoetes acadiensis), one of nature’s most intriguing botanical puzzles. Despite its grass-like appearance, this fascinating plant is actually more closely related to ancient ferns than to any modern grass. If you’ve ever wondered about those mysterious tufts of narrow, quill-like leaves poking up from shallow water in northeastern wetlands, you might just be looking at one of these living fossils.

What Exactly Is a Quillwort?

Quillworts belong to an ancient group of plants that have been around since before dinosaurs roamed the Earth. Unlike flowering plants, they reproduce through spores rather than seeds, making them evolutionary cousins to ferns and mosses. The Acadian quillwort gets its name from its distinctive appearance – clusters of narrow, hollow leaves that emerge from an underground base like a bunch of old-fashioned quill pens.

This perennial plant is native to both Canada and the lower 48 states, specifically found in New Brunswick, Nova Scotia, Newfoundland, and several northeastern U.S. states including Maine, Massachusetts, New Hampshire, New Jersey, New York, Vermont, Virginia, and even the District of Columbia.

Where You’ll Find Acadian Quillworts

If you’re hoping to spot an Acadian quillwort in the wild, you’ll need to look in very specific places. These plants are obligate wetland species, meaning they almost always occur in wetlands across all their natural regions. Think shallow ponds, lake edges, temporary pools, and boggy areas where the water level fluctuates seasonally.

The plant has a Global Conservation Status of S3Q, indicating some level of rarity and the need for careful monitoring of populations.

Is It Beneficial for Your Garden?

Here’s where things get interesting – and a bit challenging. While Acadian quillworts are undoubtedly fascinating from a botanical perspective, they’re not practical garden plants for most people. Here’s why:

  • They require very specific wetland conditions that are difficult to replicate
  • They have minimal ornamental value compared to other aquatic plants
  • They’re rarely (if ever) available through commercial nurseries
  • They don’t provide the typical benefits gardeners seek, like flowers for pollinators

However, if you’re involved in wetland restoration, maintaining a natural pond ecosystem, or creating a specialized bog garden, these plants could play an important ecological role in supporting authentic native plant communities.

How to Identify Acadian Quillworts

Spotting an Acadian quillwort requires a keen eye, as they’re easily overlooked. Here’s what to look for:

  • Clusters of narrow, hollow, grass-like leaves emerging from shallow water
  • Leaves are typically 2-6 inches tall and very slender
  • No visible flowers – remember, these reproduce via spores
  • Found only in consistently wet or submerged conditions
  • Often growing alongside other wetland plants like sedges and rushes

A Word About Conservation

Given their rarity status, if you’re lucky enough to encounter Acadian quillworts in the wild, it’s best to admire them from a distance. These plants are important indicators of healthy wetland ecosystems, and their populations need protection rather than harvesting.

For most gardeners, appreciating quillworts means supporting wetland conservation efforts and choosing other native aquatic plants for water features. Plants like native sedges, rushes, and water lilies can provide similar ecological benefits while being more suitable for garden cultivation.

The Bottom Line

Acadian quillworts are remarkable survivors from an ancient world, offering us a glimpse into plant evolution and the importance of protecting specialized wetland habitats. While they won’t win any beauty contests in your garden, they’re invaluable pieces of our natural heritage. Sometimes the most important plants are the ones we simply leave alone to do what they do best – quietly maintaining the ecological balance of their watery worlds.

Acadian Quillwort

Classification

Group

Quillwort

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision
Division

Lycopodiophyta - Lycopods

Subdivision
Class

Lycopodiopsida

Subclass
Order

Isoetales

Family

Isoetaceae Dumort. - Quillwort family

Genus

Isoetes L. - quillwort

Species

Isoetes acadiensis Kott - Acadian quillwort

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA